Bottle stopper



FIG. 1 is a perspective view of a bottle stopper showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a left side view thereof;

FIG. 4 is a front view thereof;

FIG. 5 is a right side view thereof;

FIG. 6 is a back view thereof; and,

FIG. 7 is a bottom view thereof.

The broken lines shown in the drawings depict portions of the bottle stopper in which the design is embodied that form no part of the claimed design. 

CLAIM The ornamental design for a bottle stopper, as shown and described. 